Gas-eetobt



J. DAVIS & S. OHADDOGKJ.

GAS RBTORT.

No. 27,113. Patented Feb. 14, 1860.

fi a'fnzsses. Zi Z, 43 224444 Jim/m W UNITED STATES PATENT OFFICE.

JOHN DAVIS AND STURGIS CHADDOCK, OF BOSTON, MASSACHUSETTS.

GAS-RETORT.

Specification of Letters Patent N 0. 27,113, dated February 14, 1860.

To all whom it may concern:

Be it known that we, JOHN DAVIS and STURcIs CHADDOCK, of Boston, in thecounty of Suffolk and State of Massachusetts have invented a new anduseful or Improved Portable Flue Gas-Retort; and we do hereby declarethat the same is fully described and represented in the followingspecification and the accompanying drawings, of which Figure 1 denotes aside elevation of the said retort. Fig. 2 is a vertical and longitudinalsection of the same; Fig. 3, a horizontal section of it, taken throughthe movable fines, to be hereinafter described. Fig. 4 is a top view andFig. 5 an inner face "iew of the door to be hereinafter described.

It is well known that in the manufacture of gas, the longer the gas iskept in a heated state, the purer it will be, and that in gas retorts asat present constructed, the fines for the reception and distribution ofgas are very liable to be filled and choked up with carbon, and that itis very difiicult to keep them clear.

The object of our invention is to construct a gas retort with movablefiues, which can very readily be removed for the purpose of beingcleaned, or to substitute new ones, should it be desirable. By ourinvention we also retain the gas within the retort until its immediateentrance into the stand pipe, without passing through a mouth pieceoutside of the retort, as is usually done, and we thus make a saving inthe quality and quantity of the gas. e also provide the retort with asafety valve for the purpose of allowing the gas to escape directly fromthe retort to the stand pipe, should the retort become too heavilycharged with gas by the fines becoming obstructed, or by any othermeans.

In the drawings above mentioned A, denotes the main body of a gasretort, the same to be set in brick work or other proper material,entirely up to its front surface, the said retort to be made of castiron, clay, or other material. In the interior of the retort, and ashort distance in rear of the front part of the same, is a collar orprojection which runs nearly around the inner periphery of the retort,or to within about six inches of the bottom thereof.

C, is the door of the retort, and is constructed on its inner face witha collar or projection running nearly around it, as seen in Fig. 5,which abuts against the collar above mentioned of the retort, and thusforms a tight flue D, around the door C, for the passage of the gas intothe stand pipe boX. Ive also place within the retort, and about eightinches above the bottom thereof, two or other suitable number of movableflues B, which extend into the interior of the retort about threequarters of its length, the said fiues being made to fit tightly, attheir outer front ends, in holes made in the collar in the front part ofthe retort, and at their rear ends in small projections 0, cast in thebody of the retort, as seen in the drawings. The said fines are alsomade a very little smaller at their rear ends, in order that they mayeasily be started and withdrawn from the retort. Thus it will be seenthat we not only keep the door entirely within the retort and exposed toits heat, but by means of the flue or passage D, around the door, andthe tines B, connected with it, we expose the gas within them to theWhole heat ofthe retort, without exposing it to the outer atmosphere, asin retorts whose mouthpiece extends outside of them.

F, is a stand pipe box constructed on the top part of the retort andimmediately over the flue D, and is made with an inclined under side asseen in Fig. 1, the said under side projecting beyond the front face ofthe retort, and made open, and is to be closed by a small cover orprojection a, formed on the upper part of the door C. By removing thedoor C, and with it the cover a, the stand pipe and its box can becleaned very easily and effectually, and the movable fiues B,

can also be removed and cleaned very expeditiously, or new onessubstituted if necessary. Ive also place a safety valve E, on the toppart of the inner projection of the door C, as seen in Fig. 4, whichwill open, if the retort becomes too heavily charged with gas by thefines becoming clogged, -or other causes, and allow the superfluous gasto escape into the stand pipe.

It will be seen that the difference between our retort, and the retortof H. K. Symmes patented Aug. 23, 1859, independent of the difference inthe construction of the fines themselves, consists in taking the gasfrom the lower part of the retort and passing it through the flue aroundthe door previous to it entrance into the stand pipe, instead ofconducting it immediately into the stand pipe, from the upper part ofthe retort, as in Symmes patent. And thus by our invention We keep thegas confined in a small space in passage from the retort, longer than byany other contrivance at present in use, and consequently the oil andcoal tar are more effectually consumed, and the gas rendered purer, andof greater quantity.

1. With regard to the movable flues We do not claim a semicircular pieceof metal,

-made to slide on lips and form a passage in the top of the retort,after it is placed within the retort, and leading directly from the topof the retort into the stand pipe, as in the case of H. K. Symmes abovereferred to, but What We do claim is the movable flues B, constructedand applied as above described, in connection With the door C, and itsflue or projection D, and the collar of the retort, substantially inmanner and for the purpose as above described.

2. So With regard to the door of the retort, We do not claim a doubledoor With its exterior portion outside the main body of the retort, asin the patents of Alonzo M. Giles, March 17, 1859, and John L. Stewart,June 1st, 1858, but What We do claim is the peculiar construction of thedoor 0, with its projection or flue D, in connection With the collar ofthe retort, and the movable flues B, the Whole being applied to theinterior of the retort, and operating together, substantially in mannerand for the purposes as above set forth.

3. We also claim the combination of the safety valve With the flue D, ofthe door C. in manner and for the purpose as above specified.

In testimony whereof We have hereunto set our signatures this first dayof October JOHN DAVIS. STURGIS CHADDOCK. Witnesses:

B. WELLS DUNKLEE, FREDERICK CURTIS.

